| LABORATORY RECORD | PERIOD OF RETENTION |
| Proficiency Testing Results (copies of what was submitted to the PT provider) | 2 years |
| Attestation Statement | 2 years |
| Proficiency Testing Evaluations | 2 years |
| All other PT related forms | 2 years |
| LABORATORY RECORD | PERIOD OF RETENTION |
| Test Requisitions | 2 years |
| Test Records | 2 years |
| Immunohematology | 5 years |
| Test Reports | 2 years |
| Immunohematology | 5 years |
| LABORATORY RECORD | PERIOD OF RETENTION |
| Discontinued procedures | 2 years |
| Method Performance Specifications | 2 years |
| Equipment Maintenance and Function Checks | 2 years |
| Calibration and Calibration Verification | 2 years |
| Control Procedures (e.g., daily QC records) | 2 years |
| Remedial Action - errors in reported results (both the original and corrected report) | 2 years |